# physic

Most popular questions-
## Physic

A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle è = 40° with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (a) the frictional force on

*asked by Don on September 28, 2011* -
## Physic

1. Water at a pressure of 3.00 x 10 5th Pa flows through a horizontal pipe at a speed of 1.00 m/s. The pipe narrows to one-fourth its original diameter. What is the speed of the flow in the narrow section? Not sure was successfully posted

*asked by Leo on December 5, 2012* -
## physic

Superman must stop a 120km/h train in 150m to keep it from hitting a stalled car on the tracks.If the train's mass is 3.6x10^5kg,how much force must he exert?Compare to the weight of the train (give as%).How much force does the train exerts on Superman?

*asked by noah on July 2, 2011* -
## Physic

A violin string has a standard length of 32.8 cm. It sounds the musical note A (440Hz) when played without fingering. How far from the end of the string should you place your finger to play the note C (523Hz)? answer should be in cm.

*asked by K. on November 7, 2009* -
## Physic

A spring 20cm long is stretched to 25cm by a load of 50N.What will be its length when stretched by 100N assuming that the elastic limit is not reached?

*asked by Bamiduro on May 15, 2014* -
## physic

Approaching one of the many sharp horizontal turns in the Monaco Grand Prix, an experienced Formula-1 driver slows down from 125 km/h to 53.0 km/h while rounding the bend in 12.0 s. If the driver continues to decelerate at this same rate and the radius of

*asked by joy on January 31, 2018* -
## Physic

Two resistors when connected in series to a 120-V line use one-fourth the power that is used when they are connected in parallel. If one resistor is 4.8 kohms. what is the resistance of the other?

*asked by Allen on April 12, 2015* -
## physic

During a visit to New York City, Lil decides to estimate the height of the Empire State Building (see figure below). She measures the angle θ of elevation of the spire atop the building as 17°. After walking x = 9.28 ✕ 102 ft closer to the iconic

*asked by joy on January 18, 2018* -
## physic

you are designing a diving bell to withstand the pressure of sea water at a depth of 250m. a)what is the quage pressure at the depth(you can ignor the small changes in the density of the water with depth.) b)at the 250m depth, what is the net force due to

*asked by ted on July 20, 2010* -
## Physic

Hi, I'm learning about simple harmonic motion of a mass-spring system and I've been working at 2 problems for the past hour. I believe I have the right formula and I know what the answers should be but Im getting a different answer. Can you explain it step

*asked by Elizabeth on January 20, 2015* -
## PHYSIC

A bus moving at a constant speed of 5.00 m/s passes you. When the rear of the bus is 12.0 m past you, you run toward it with acceleration of 0.96 m/s^2. How far would you have to run before you catch up with the rear of the bus, and how fast must be

*asked by AH on September 11, 2017* -
## Physic

You walk 55 m to the north, then turn 60° to your right and walk another 46 m. How far are you from where you originally started? Can someone help me with this question please? I have tried Pythagorean but it did not work. thank

*asked by John Yi on August 28, 2012* -
## physic

Planet A and planet B are in circular orbits around a distant star. Planet A is 4.5 times farther from the star than is planet B. What is the ratio of their speeds vA/vB?

*asked by ozer on July 13, 2013* -
## Physic

A wave pulse travels along a string at a speed of 160cm/s. Note that part a is independent and refer to changes made to the original string. Part A:What will be the speed if the string's tension is doubled? I was thinking that it should be 320...but i

*asked by Arooj on November 7, 2009* -
## physic

a tank contains 26.0 kg of oxygen gas at a gauge pressure of 8.70 atm. if oxygen is replaced by helium, how many kilograms of the latter will be needed to produce a gauge pressure at 7.00 atm?

*asked by yuri on October 12, 2010* -
## physic

A golfer hits his approach shot at an angle of θ = 52.8°, giving the ball an initial speed of v0 = 37.0 m/s (see figure below). The ball lands on the elevated green, yf = 5.3 m above the initial position near the hole, and stops immediately. (a) How much

*asked by joy on January 31, 2018* -
## physic

Starting from rest, a car accelerates at 2.5 m/s^2 up a hill that is inclined 5.4 ^\circ above the horizontal. how far the car travel horizontally in 15s?

*asked by Anonymous on July 2, 2011* -
## physic

Two spherical balls are placed so their centers are 2.6 m apart. The force between the two balls is 2.75 x 10-12 N. What is the mass of each ball if one ball is twice the mass of the other ball?

*asked by susan on January 18, 2010* -
## PHYSIC

A square wire loop 10.0 cm on each side carries a clockwise current of 15.0 A. Find the magnitude and direction of the magnetic field B at its center due to the four 1.20 mm wire segments at the midpoint of each side?

*asked by KAIT on September 6, 2011* -
## Physic

A fan at a rock concert is 30 m from the edge of the stage. The sound intensity level at the edge of the stage is 110 dB. The fan's eardrums have a diameter of 8.4mm. How much energy is transferred to each eardrum in one second? (Hint: It may help to asume

*asked by Jimmy on November 7, 2009* -
## physic

An object of mass m is at rest at the top of a smooth slope of height h and length L. The coefficient of kinetic friction between the object and the surface, μk, is small enough that the object will slide down the slope if given a very small push to get

*asked by physic ----please help on October 23, 2014* -
## Physic

Two point charges of +40x10^-6C and -60x10^-6 are placed 50 cm apart. What is the distance from +40x10^-6 charge along the line joining the two point charges if the resultant potential is zero.. Can you give me the exact formula to do this question and

*asked by Syam on December 17, 2014* -
## physic

A force F⃗ = 12 N i^ − 10 N j^ acts on an object. How much work does this force do as the object moves from the origin to the point r⃗ = 13 m i^ + 11 m j^?

*asked by kolam on July 13, 2013* -
## Physic

Two wave pulses on a string approach one another at the time t = 0, as shown in the figure below, except that pulse 2 is inverted so that it is a downward deflection of the string rather than an upward deflection. Each pulse moves with a speed of 1.0 m/s.

*asked by Anonymous on November 22, 2014* -
## physic

A long straight horizontal wire carries a current = 3.90 A to the left. A positive 1.00 C charge moves to the right at a distance 1.50 m above the wire at constant speed v = 5000 m/s. What is the magnitude of the magnetic field at the location of the

*asked by john on March 8, 2012* -
## physic

The amplitude of an oscillator decreases to 36.2% of its initial value in 20.5 s. What is the value of the time constant?

*asked by elena on December 5, 2009* -
## Physic

Three balls are attached to a light rigid rod, as shown in the figure. A fulcrum is located at xf = 18.0 cm measured from the left end of the rod. Ball A has mass mA = 65 g and is located at xA = 3 cm. Ball B has mass mB = 12 g located at xB = 22 cm. Ball

*asked by panda on March 3, 2011* -
## physic

two particles moving along x-axis in the same direction with uniform velocity is 8 metre per second and 4 metre per second initially the first particle is 21 m to the left of the origin and the second one is 7 m to the right of the origin to particle meets

*asked by ruchiket on August 3, 2017* -
## physic

Need Help please. Consider the following mass distribution where the x and y coordinates are given in meters: 5.0 kg at (0.0, 0.0) m, 3.0 kg at (0.0, 4.3) m, and 4.0 kg at (2.8, 0.0) m. Where should a fourth object of 8.2 kg be placed so the center of

*asked by Chan on November 23, 2009* -
## physic

a ball rolls off a desk at a speed of 3.0m/s and lands 0.40 seconds later. How far from the base of the desk does the ball lands?

*asked by sharmaine bell on November 14, 2012* -
## physic

A satellite used in a cellular telephone network has a mass of 2010kg and is in a circular orbit at a height of 770km above the surface of the earthTake the gravitational constant to be G = 6.67×10−11N⋅m2/kg2 , the mass of the earth to be me =

*asked by cuzer on July 11, 2013* -
## physic

A bobsled slides down an ice track starting (at zero initial speed) from the top of a(n) 146 m high hill. The acceleration of gravity is 9.8 m/s2 . Neglect friction and air resistance and de- termine the bobsled’s speed at the bottom of the hill. Answer

*asked by Drake on January 11, 2011* -
## Physic

The back wall of an auditorium is 29.0 m from the stage. If you are seated in the middle row, how much time elapses between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall?

*asked by Jimmy on November 8, 2009* -
## Physic

A dam is used to block the passage of a river and to generate electricity. Approximately 58.4 x 103 kg of water falls each second through a height of 20.1 m. If one half of the gravitational potential energy of the water were converted to electrical

*asked by Monet Nguyen on October 13, 2012* -
## physic

The figure shows the y-position (in blue) of a particle versus time. (a) What is the average velocity of the particle during the time interval t = 1.50 s to t = 4.50 s? (Express your answer in vector form.) Incorrect: Your answer is incorrect.

*asked by joy on January 21, 2018* -
## Physic

A 2.5-kohms and a 3.7-kohms resistor are connected in parallel; this combination is connected in series with a 1.4 kohms resistor. If each resistor is rated at 0.5W (maximum without overheating), what is the maximum voltage that can be applied across the

*asked by Allen on April 9, 2015* -
## physic

two figure skaters, one weighting 625N and the other 725N,push off against each other on frictionless ice. a) if the heavest skater travels at 1.50m/s, how fast will the lighter one travel? b)how much kinetic energy is created during the skaters manauver,

*asked by kris- on July 20, 2010* -
## physic

A "seconds pendulum" is one that moves through its equilibrium position once each second. (The period of the pendulum is precisely 2.000 s.) The length of a seconds pendulum is 0.9928 m at Tokyo and 0.9943 m at Cambridge, England. What is the ratio of the

*asked by sisca on May 20, 2011* -
## Physic

A 65 kg dancer leaps .32 m high. a) With what momentum does the dancer reach the ground? b) What impulse is needed to make a stop? c) As the dancer lands, the knees bend, lengthening the stopping time to .050 s. Find the average force exerted on the body.

*asked by Einstein on December 14, 2007* -
## Physic

A car is driven at a constant speed of 21m/s down a road.the car engine delivers 48 kw of power.Calculate the force of friction that is resting the motion on the car.

*asked by Joveal on January 31, 2016* -
## physic

two point charges are placed on the x axis as follows: charge q1 +4.00nc is located at x = 0.200m, and charge q2 = +5.00nc is at x = -0.300m what are the magnitude and directionof the net force exerted by these two charges on a negative point charge q3 =

*asked by yanis on February 12, 2013* -
## Physic

What is the period of revolution of a satellite with mass m that orbits the earth in a circular path of radius 7820 km (about 1450 km above the surface of the earth)?

*asked by Andrea on July 10, 2010* -
## physic

A circus performer stands on a platform and throws an apple from a height of 49 m above the ground with an initial velocity v0 as shown in the figure below. A second, blindfolded performer must catch the apple. If v0 = 30 m/s, how far from the end of the

*asked by joy on January 30, 2018* -
## physic

two point charges are located on the y axis as follows : charge q1 = -1.50nc at y= -0.600m, and charge q2 = +3.2nc at the origin (y=0) what is the net force (magnitude and direction) exerted by these two charges on a third charge q3 = +5.00 nc located at y

*asked by yanis on February 12, 2013* -
## physic

The fan blades on a jet engine make one thousand revolutions in a time of 87.6 ms. What is the angular frequency of the blades?

*asked by nada on January 20, 2014* -
## physic

A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 22 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop.

*asked by joy on February 1, 2018* -
## Physic

Consider the equation v = (1/4)zxt^2. The dimensions of the variables v, x, and t are [L]/[T], [L], and [T], respectively. The numerical factor 4 is dimensionless. What must be the dimensions of the variable z, such that both sides of the equation have the

*asked by isalbelle on September 5, 2013* -
## physic

Consider the earth following its nearly circular orbit (dashed curve) about the sun.(Figure 2) The earth has mass mearth=5.98×1024kg and the sun has mass msun=1.99×1030kg. They are separated, center to center, by r=93millionmiles=150millionkm.

*asked by mert on July 11, 2013* -
## physic

A 2,300-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 3.00 m before coming into contact with the top of the beam, and it drives the beam 9.4 cm farther into the ground as it comes to rest. Using energy

*asked by Anonymous on October 19, 2012* -
## physic

An arrow is fired with initial velocity v0 at an angle θ from the top of battlements, a height h above the ground. (Assume θ is measured above the horizontal.) (a) In terms of h, v0, θ, and g, what is the time at which the arrow reaches its maximum

*asked by joy on January 30, 2018* -
## Physic

A penny on its side moving at speed v slides off the horizontal surface of a table a vertical distance y from the floor. a) Show that the penny lands a distance v√(2y/g) from the base of the coffee table. b) If the speed is 3.5 m/s and the coffee table

*asked by Kay on November 7, 2014* -
## Physic

A 61-kg skier, coasting down a hill that is an angle of 23 to the horizontal, experiences a force of kinetic friction of magnitude 72N. The skier's speed is 3.5m/s near the top of the slope. Determine the speed after the skier has travelled 62m downhill.

*asked by Tristan on August 14, 2013* -
## physic

An in-ground swimming pool has the dimensions 20 m x 15 m. It is filled with water to a uniform depth of 3.00 m.What is the total force exerted on the bottom of the swimming pool?The density of water = 1.00 × 103 kg/m3.

*asked by Anonymous on January 9, 2016* -
## physic

Part 1 A 3.0 kg block is pushed 3.0 m at a constant velocity up a vertical wall by a constant force applied at an angle of 30.0 ◦ with the horizontal, as shown in the ﬁgure. The acceleration of gravity is 9.81 m/s2. If the coeﬃcient of kinetic

*asked by ally on February 25, 2011* -
## physic

A long wire carrying a 6.0 A current perpendicular to the xy-plane intersects the x-axis at x=âˆ’2.0cm. A second, parallel wire carrying a 2.0 A current intersects the x-axis at x=+2.0cm. At what point on the x-axis is the magnetic field zero if the

*asked by Anonymous on November 14, 2016* -
## physic

A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 7.00×10^-3 m/s^2 less than that at sea level. What is the observatory's altitude?

*asked by peggy on December 4, 2009* -
## PHYSIC

A bullet is fired in a horizontal direction with a muzzle velocity of 300m\s in the absence of air resistance,how far will it have dropped in travelling a horizontal distance of (a)20m (b)40m (c)60m (d)how far will it drop in one second

*asked by JOY on October 22, 2016* -
## physic

Suppose a runner completes one lap around a 400-m track in a time of 50 s. Calculate the average speed of the runner. please explain process

*asked by rachel on September 12, 2015* -
## physic

1) A 2 . 3 kg object moving at 7.3 m/s collides inelastically with a 4.0 kg object which is initially at rest. What percentage of the initial kinetic energy of the system is lost during the collision?

*asked by quaviz on December 5, 2012* -
## physic

Superman must stop a 120km/h train in 150m to keep it from hitting a stalled car on the tracks.If the train's mass is 3.6x10^5kg,how much force must he exert?Compare to the weight of the train (give as%).How much force does the train exerts on Superman?

*asked by noah on July 2, 2011* -
## PHYSIC

You are a member of an alpine rescue team and must project a box of supplies, with mass m, up an incline of constant slope angle α so that it reaches a stranded skier who is a vertical distance h above the bottom of the incline. The incline is slippery,

*asked by kolam on July 14, 2013* -
## physic

julianna walked 45 meters east, 45 meters souuth, and 45 meters north. what is her resultant displacement? My answer was 45 meters west. is this correct

*asked by julien on October 17, 2009* -
## physic

two point charges, Q1=-25microcoulomb and Q2=+50 microcoulomb, are separated by a distance of 12 cm. the electric field at the point P is zero. how far from Q1 is P? @__________@_______________________@ P -25 +50

*asked by fara on January 22, 2011* -
## physic

A 69-cm-diameter wheel accelerates uniformly about its center from 150rpm to 320rpm in 4.4s . Determine angular acceleration?

*asked by Charles on March 29, 2014* -
## physic

Consider a train that rounds a curve with a radius of 570m at a speed of 160 km/h (approximately 100 mi/h)Calculate the friction force needed on a train passenger of mass 75kg if the track is not banked and the train does not tilt.

*asked by mert on July 6, 2013* -
## physic

Search: The barrels of the 16 in guns (bore diameter = 16 in. = 41 cm) on the World War II battleship U.S.S. Massachusetts were each 15 m long. The shells each had a mass of 1050 kg and were fired with sufficient explosive force to provide them with a

*asked by Anonymous on October 14, 2010* -
## physic

A block with mass m1 hangs from a rope that is extended over an ideal pulley and attached to a second block with mass m2 that sits on a ledge. The second block is also connected to a third block with mass m3 by a second rope that hangs over a second ideal

*asked by joy on February 7, 2018* -
## Physic

A 2.28 kg bucket is attached to a disk-shaped pulley of radius 0.104 m and mass 0.712 kg. If the bucket is allowed to fall, calculate the tension in the rope.

*asked by Anonymous on November 15, 2014* -
## physic

Calculate the pressure exerted on the ground by a79kg person standing on one foot. Assume that the bottom of the person's foot is 13cm wide and 28cm long.

*asked by steve on July 21, 2010* -
## Physic

A block of mass 0.500 kg is pushed against a horizontal spring of negligible mass until the spring is compressed a distance x ( see Fig. below)The force constant ofthe spring is 450 N/rn. When it is released the block travels along a frictionless,

*asked by Pongsathorn on January 29, 2017* -
## Physic

A dolphin experiences a force of 320 N [up] when it jumps out of the water. The acceleration of the dolphin is 2.6 m/s 2 [up]. (a) Calculate the mass of the dolphin. (b) What would be the acceleration of the dolphin if it had the same strength but half the

*asked by Michelle on October 20, 2011* -
## physic

Which of these diagrams may possibly correspond to the situation at point B on the motion diagram? Type, in increasing order, the numbers corresponding to the correct diagrams. Do not use commas. For instance, if you think that only diagrams 3 and 4 are

*asked by padi on August 5, 2010* -
## physic

The position function x(t) of a particle moving along an x axis is x = 6.00 - 8.00t2, with x in meters and t in seconds. (a) At what time and (b) where does the particle (momentarily) stop? At what (c) negative time and (d) positive time does the particle

*asked by sara on September 26, 2015* -
## physic

You are given two waves, a transverse wave that moves to the right f1(x) and a transverse wave that moves to the left f2(x), on a string. As the problem begins, the wave f1(x) is moving to the right at v1 = +1 m/s and the wave f2(x) is moving to the left

*asked by rama on March 22, 2011* -
## physic

The figure below shows a box of dirty money (mass m1 = 4.0 kg) on a frictionless plane inclined at angle θ1 = 35°. The box is connected via a cord of negligible mass to a box of laundered money (mass m2 = 2.0 kg) on a frictionless plane inclined at angle

*asked by joy on February 27, 2018* -
## physic

Three vectors are shown in the figure below, but they are not drawn to scale. The sum of the three vectors is R = F1 + F2 + F3. If Ry = 0 and F2 = 0.2F3, find Rx in terms of F1. the Answer Keyis 0.327.can somebody show me how to get to the answer key. I

*asked by joy on January 28, 2018* -
## Physic

If the coefficient of static friction for tires on a road is 0.25, at what maximum speed can a car round a level 47.5 m radius curve without slipping?

*asked by Diana on January 3, 2011* -
## physic

Find the force a 67.5 kg man would experience while standing in the surface of each of the following planets PLANET 1. EARTH 2. MARS 3. PLUTO Mass for earth 5.98 x 10^24 kg for mars 6.34 x 10 ^23 kg for pluto 5 x 10^23 kg distance distance for planet 6.337

*asked by Dulce on July 13, 2014* -
## physic

The sports car in Figure 6 is travelling along 30 banked road having a radius of curvature of ñ=152 m. If the coefficient of static friction between the tires and the road is µs=0.2, determine the maximum safe speed so no slipping occurs. Neglect the

*asked by zainab on March 25, 2014* -
## physic

You are driving into St. Louis, Missouri, and in the distance you see the famous Gateway-to-the-West arch. This monument rises to a height of 192 m. You estimate your line of sight with the top of the arch to be 7.37 ° above the horizontal. Approximately

*asked by Anonymous on September 9, 2012* -
## Physic

If you shout across a canyon and hear the echo 0.57 s later, how wide is the canyon?

*asked by Lua on May 3, 2010* -
## physic

Two currents from different sources flow in opposite directions through a resistor. I1 is measured as 79 mA on a 100 mA analog instrument with an accuracy of ±3% of full scale. I2, determined as 31 mA, is measured on a digital instrument with a ±100 µA

*asked by mary on April 6, 2017* -
## Physic

A 75-W, 120-V bulb is connected in parallel with 25-W, 120-V bulb. What is the net resistance?

*asked by Allen on April 9, 2015* -
## Physic

If a scuba diver fills his lungs to full capacity of 5.5LL when 8.2mm below the surface, to what volume would his lungs expand if he quickly rose to the surface? Assume he dives in the sea, thus the water is salt.

*asked by Anonymous on May 10, 2014* -
## Physic

An airplane flew 1000km in 4h. What was the airplanes speed?

*asked by Brionna on February 5, 2012* -
## physic

A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 30 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop.

*asked by Dr. Neutron on February 1, 2018* -
## physic

A firecracker explodes into four equal pieces (see figure below). Given the magnitude and direction of the velocity for each piece and the coordinate system shown, determine the x and y velocity components for each piece of the firecracker. (Assume the

*asked by joy on January 26, 2018* -
## physic

A 0.500 kg sphere moving with a velocity (2.00 - 3.10 + 1.00) m/s strikes another sphere of mass 1.50 kg moving with a velocity (-1.00 + 2.00 - 3.30) m/s. (a) If the velocity of the 0.500 kg sphere after the collision is (-0.90 + 3.00 - 8.00) m/s, find the

*asked by carlton on November 27, 2011* -
## physic

use draw a force diagram of a crash - test dummy in a car at the moment of collision.for this proplem, assume that the forces acting on the car are 19 600n downward, 17 800 n forward, and 25 000 n backward. the forces acting on the dummy are 585 n

*asked by nie on October 9, 2011* -
## physic

An air column in a glass tube is open at one end and closed at the other by a movable piston. The air in the tube is warmed above room temperature, and a 350 Hz tuning fork is held at the open end. Resonance is heard when the piston is at a distance d1 =

*asked by sisca on June 1, 2011* -
## physic

A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case. Case A: Thrown straight up. Case B: Thrown straight down. Case C: Thrown out at an angle of

*asked by lisa on July 21, 2010* -
## Physic

A plane progressive wave is represented by the equation: y= 0.1sin(200pi(t)-20pi/15(x)) where y is the displacement in metres, t is in seconds and x is the distance from a fixed origin O in metres. Find (i) the frequency of the wave, (ii) its wavelength

*asked by Johm on August 26, 2013* -
## physic

A cheetah is crouched in ambush 20m to the east of an observers blind. At time t=0 the cheetah charges an aeroplane in a cleaning 50m east of the observer. The cheetah runs along the straight line.

*asked by helen on February 19, 2014* -
## physic

Draw the vector C⃗ =0.5A⃗ +2B⃗ .

*asked by koram on October 10, 2013* -
## physic

A spring (80 {\rm N/m}) has an equilibrium length of 1.00 {\rm m}. The spring is compressed to a length of 0.50 {\rm m} and a mass of 2.1 {\rm kg} is placed at its free end on a frictionless slope which makes an angle of 41 ^\circ with respect to the

*asked by fatiey on August 28, 2010* -
## physic

please help me im stuck. A 400 g air-track glider attached to a spring with spring constant 9.00 N/m is sitting at rest on a frictionless air track. A 600 g glider is pushed toward it from the far end of the track at a speed of 94.0 cm/s. It collides with

*asked by jordan on December 5, 2009* -
## physic

1.What is the gravitational force between two trucks, each with a mass of 2.0 x 10^4 kg, that are 2.0 m apart? (G = 6.673 x 10^11 N•m^2/kg^2) 2.Each tire of an automobile has an area of 0.026 m^2 in contact with the ground. The weight of the automobile

*asked by Jan on December 17, 2006* -
## Physic

A ceiling fan is rotating at 0.50 rev/s. When turned off, it slows uniformly to a stop in 11 s. (a) How many revolutions does it make in this time? (b) Using the result from part (a), find the number of revolutions the fan must make for its speed to

*asked by Anonymous on November 1, 2014* -
## PHYSIC

a solid aluminum ingot weighs 89N in air a)what is the volume b)the ingot is suspended from a rope and totally immersed in water. what is the tension in the rope(the apparent weight of the ingot in water)?

*asked by KELLY on July 20, 2010* -
## physic

A cannon ball is fired at an angle of 30° above horizontal with an initial speed vi = 55 m/s. Assume the cannon ball leaves the cannon at ground level and ignore air resistance. (a) How long is the cannon ball in the air? (b) How far from the base of the

*asked by Nicolas on November 21, 2014*